Black Mastic Asbestos
Many black mastics produced during the mid 20th century were made with asbestos.
Black mastic asbestos. It is safe to seal and prime asbestos black mastic and add a decorative floor over a once black asbestos mastic floor that wasn t removed but safely and properly sealed and primed. Asbestos have been proven to cause a life threatening condition called mesothelioma. If the mastic has been exposed to the open air for a long time it may have a gray tint though. If you have a cracked or missing tile and there is a black paste where the tile used to be it could be asbestos.
What is asbestos floor tile mastic. Asbestos mastic is always black. How can you know. Asbestos floor tile mastic is an adhesive that was used to stick tile and linoleum to floors of houses before the prohibition of asbestos containing products.
Compounding the problem is that black asbestos mastics from this time were incredibly cheap so they were widely used in both residential and commercial buildings. Black mastic often contains asbestos. Asbestos has been proven to cause a life threatening condition called mesothelioma. So before you do anything with black mastic in your home it is important to identify it and deal with it appropriately.
Often this type of adhesive was referred to as black tile mastic. The problem now is that these homes were built more than fifty years ago. However one wrinkle in this question. Asbestos was used in flooring adhesives because it was hard wearing and durable.
Asbestos of course has been medically proven to cause the life threatening condition known as mesothelioma. Over time these flooring tiles become loose and chip and the asbestos. The main concern surrounding this question is that black mastic often contains asbestos.